Siemens SENTRON VL 3LD2 Main and Emergency OFF Switch

Operating Instructions

Introduction

This document provides operating instructions for the Siemens SENTRON VL 3LD2 series of Main and Emergency OFF switches. It covers essential safety information, installation guidelines, and details on mounting additional elements and accessories.

Important Safety Information

⚠️ DANGER: Hazardous Voltage

Will cause death or serious injury. Turn off and lock out all power supplying this device before working on it.

⚠️ CAUTION: Reliable Functionality

Reliable functioning of the equipment is only ensured with certified components.

(Note: Additional safety warnings in multiple languages are present in the original document.)

General Installation and Operation

Before installing, operating, or maintaining the equipment, it is essential to read and understand these instructions.

Ensure that the device is de-energized and locked out before commencing any work.

Technical Data and Specifications Summary

The original document contains detailed technical specifications across various models within the 3LD2 series. These include:

Connection screw torque values for switches and auxiliary switches.
Required connecting cross-sections for solid and stranded wires, including flexible cables with ferrules and AWG equivalents.
Specifications for fastening screws, plastic nuts, and handle screws, including their respective torque values.
Detailed tables listing dimensions (A, B, A1, C, D, d, F, G, K, L, etc.) and drilling patterns for different model variants (e.g., 3LD20.., 3LD21../22.., 3LD25.., 3LD27../28.., 3LD23../24..).
Information on mounting additional elements, such as protective earth and neutral conductor terminals.
Details on door coupling installation, including pull-out strength and hinge spacing requirements (e.g., pull-out strength ≥ 600 N, hinge spacing ≥ 100 mm).

For specific model details, please refer to the original documentation.

For technical support, visit: https://www.siemens.com/support-request

Mounting Additional Elements and Accessories

Additional elements, such as protective earth and neutral conductor terminals, can be mounted on the left or right side of the switch. Ensure they are pushed forward until they click into place.

It is possible to mount one additional element on each side. A switchable neutral conductor can accommodate an additional earthing terminal (PE) or a non-switchable neutral conductor (N).

Accessories are removed by sliding them in the opposite direction of mounting.

Door Coupling Installation

When installing door couplings, ensure the pull-out strength of locked mechanisms is at least 600 N when pulling directly on the mechanism in the direction of the shaft. The door hinge spacing must be at least 100 mm.

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